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Subsequent Events (CenterPoint Energy) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Aug. 04, 2020
Jul. 29, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Subsequent Event [Line Items]            
Dividends declared per share     $ 0.1500 $ 0.2875 $ 0.4400 $ 0.2875
Expected cash distribution from equity method investment         $ 109 $ 149
Series A Preferred Stock [Member]            
Subsequent Event [Line Items]            
Preferred stock dividends declared     0.0000   $ 30.6250  
Series B Preferred Stock [Member]            
Subsequent Event [Line Items]            
Preferred stock dividends declared     17.5000 $ 17.5000 35.0000 $ 17.5000
Series C Preferred Stock [Member]            
Subsequent Event [Line Items]            
Preferred stock dividends declared     $ 0.1500   $ 0.1500  
Subsequent Event [Member] | Common Stock [Member]            
Subsequent Event [Line Items]            
Dividends payable, date declared   Jul. 29, 2020        
Dividends payable, date of record   Aug. 20, 2020        
Dividends payable, date to be paid   Sep. 10, 2020        
Dividends declared per share   $ 0.1500        
Subsequent Event [Member] | Series A Preferred Stock [Member]            
Subsequent Event [Line Items]            
Dividends payable, date declared   Jul. 29, 2020        
Dividends payable, date of record   Aug. 14, 2020        
Dividends payable, date to be paid   Sep. 01, 2020        
Preferred stock dividends declared   $ 30.6250        
Subsequent Event [Member] | Series B Preferred Stock [Member]            
Subsequent Event [Line Items]            
Dividends payable, date declared   Jul. 29, 2020        
Dividends payable, date of record   Aug. 14, 2020        
Dividends payable, date to be paid   Sep. 01, 2020        
Preferred stock dividends declared   $ 17.5000        
Subsequent Event [Member] | Series C Preferred Stock [Member]            
Subsequent Event [Line Items]            
Dividends payable, date declared   Jul. 29, 2020        
Dividends payable, date of record   Aug. 20, 2020        
Dividends payable, date to be paid   Sep. 10, 2020        
Preferred stock dividends declared   $ 0.1500        
Common Units [Member] | Subsequent Event [Member] | Enable Midstream Partners [Member]            
Subsequent Event [Line Items]            
Quarterly cash distribution, declaration date Aug. 04, 2020          
Quarterly cash distribution, date of record Aug. 18, 2020          
Quarterly cash distribution, distribution date Aug. 25, 2020          
Quarterly cash distribution declared per share $ 0.16525          
Expected cash distribution from equity method investment $ 39          
Series A Preferred Units [Member] | Subsequent Event [Member] | Enable Midstream Partners [Member]            
Subsequent Event [Line Items]            
Quarterly cash distribution, declaration date Aug. 04, 2020          
Quarterly cash distribution, date of record Aug. 04, 2020          
Quarterly cash distribution, distribution date Aug. 14, 2020          
Quarterly cash distribution declared per share $ 0.62500          
Expected cash distribution from cost method investment $ 9